At the headlight plug.... The white wire is the switched 12v positive for high beam.
I don't know what color the wire would be at the switch, nor do I know if that wire at the high beam switch is switched 12v or CANbus talk to the ZFE.
A lot of switches on the F8 are CANbus talk to the ZFE. I wouldnt use any other point to tap for a trigger other then the white wire that plugs into the headlight unless someone else has already tried it and NOT burned out their ZFE or screwed up the CANbus.
Owned to date. Honda Aero 50, Honda Elite 80, Honda Elite 250x2, Suzuki Katana, Suzuki RF600, Yamaha YZF1000R, Kymco Xciting 500, Suzuki GS500, Suzuki Burgman 650, BMW F800GSx2, BMW S1000RR, Aprilia Scarabeo 200, Aprilia Caponord, Aprilia Sportcity 250
I love and miss you Jeneca and I'm sorry.